Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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Switch: CRDLILAB3MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
730-273 A Carbondale IL 478J NUSO, LLC 362   2025-07-21   
730-273 1 Carbondale IL 478J NUSO, LLC 362   2025-07-21   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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